业务域名CNAME检查DNS主机地址增加Google公共DNS

internal/utils/lookup.go

@@ -3,8 +3,10 @@ package utils
 import (
 	teaconst "github.com/TeaOSLab/EdgeAdmin/internal/const"
 	"github.com/TeaOSLab/EdgeCommon/pkg/configutils"
+	"github.com/iwind/TeaGo/lists"
 	"github.com/iwind/TeaGo/logs"
 	"github.com/miekg/dns"
+	"sync"
 )
 
 var sharedDNSClient *dns.Client
@@ -33,17 +35,47 @@ func LookupCNAME(host string) (string, error) {
 	m.RecursionDesired = true
 
 	var lastErr error
-	for _, serverAddr := range sharedDNSConfig.Servers {
+	var success = false
-		r, _, err := sharedDNSClient.Exchange(m, configutils.QuoteIP(serverAddr)+":"+sharedDNSConfig.Port)
+	var result = ""
-		if err != nil {
-			lastErr = err
-			continue
-		}
-		if len(r.Answer) == 0 {
-			continue
-		}
 
-		return r.Answer[0].(*dns.CNAME).Target, nil
+	var serverAddrs = sharedDNSConfig.Servers
+
+	{
+		var publicDNSHosts = []string{"8.8.8.8" /** Google **/, "8.8.4.4" /** Google **/}
+		for _, publicDNSHost := range publicDNSHosts {
+			if !lists.ContainsString(serverAddrs, publicDNSHost) {
+				serverAddrs = append(serverAddrs, publicDNSHost)
+			}
+		}
 	}
+
+	var wg = &sync.WaitGroup{}
+
+	for _, serverAddr := range serverAddrs {
+		wg.Add(1)
+
+		go func(serverAddr string) {
+			defer wg.Done()
+			r, _, err := sharedDNSClient.Exchange(m, configutils.QuoteIP(serverAddr)+":"+sharedDNSConfig.Port)
+			if err != nil {
+				lastErr = err
+				return
+			}
+
+			success = true
+
+			if len(r.Answer) == 0 {
+				return
+			}
+
+			result = r.Answer[0].(*dns.CNAME).Target
+		}(serverAddr)
+	}
+	wg.Wait()
+
+	if success {
+		return result, nil
+	}
+
 	return "", lastErr
 }

internal/utils/lookup_test.go

@@ -8,5 +8,8 @@ import (
 )
 
 func TestLookupCNAME(t *testing.T) {
-	t.Log(utils.LookupCNAME("www.yun4s.cn"))
+	for _, domain := range []string{"www.yun4s.cn", "example.com"} {
+		result, err := utils.LookupCNAME(domain)
+		t.Log(domain, "=>", result, err)
+	}
 }